improve shutdown documentation

This fixes #290.

1 files changed, 9 insertions, 1 deletions

diff --git a/src/rc/openrc-shutdown.c b/src/rc/openrc-shutdown.c
index 45936052..82dde517 100644
--- a/src/rc/openrc-shutdown.c
+++ b/src/rc/openrc-shutdown.c
@@ -67,7 +67,15 @@ const char * const longopts_help[] = {
 	"write wtmp boot record and exit",
 	longopts_help_COMMON
 };
-const char *usagestring = NULL;
+const char *usagestring = "" \
+						   "Usage: openrc-shutdown -c | --cancel\n" \
+						   "   or: openrc-shutdown -R | --reexec\n" \
+						   "   or: openrc-shutdown -w | --write-only\n" \
+						   "   or: openmrc-shutdown -H | --halt time\n" \
+						   "   or: openrc-shutdown -K | --kexec time\n" \
+						   "   or: openrc-shutdown -p | --poweroff time\n" \
+						   "   or: openrc-shutdown -r | --reboot time\n" \
+						   "   or: openrc-shutdown -s | --single time";
 const char *exclusive = "Select one of "
 	"--cancel, --halt, --kexec, --poweroff, --reexec, --reboot, --single or \n"
 	"--write-only";